Abstract: The pressure propagation velocity in a waxy crude pipeline is a important parameter in establishing a computing model for restarting operation, which opinions in some documents are divided on and no popular model for estimating pressure propagation velocity in a waxy crude pipeline. Laboratory tests on an indoor circular pipeline have been conducted to simulate the actual pressure propagation process of restarting a waxy crude pipeline after shut-down. The results confirmed that the pore structure of the gelled oil is a critical factor affecting the pressure propagation velocity and the damping effect form the gelled crude and the bagging effect due to the gelled crude yielding in radial direction are two important factors on the basis of tests and analyses. A new model for estimating pressure propagation velocity in a waxy crude pipeline has been established with its calculating results correspond with the experimental data.